Mark Jit works a senior lecturer in vaccine epidemiology at the London School of Hygiene and Tropical Medicine, as well as a mathematical modeller and health economist at Public Health England. His main research interest is in epidemiological and economic modelling of infectious disease control interventions such as vaccination to support evidence-based public health decision making. He has investigated the cost-effectiveness of HPV vaccination, the relative value of using bivalent and quadrivalent vaccines as well as the potential health and economic implications of two-dose HPV vaccine schedules. This work has supported decision making in both developed and developing countries around the world. He is also the lead developer of PRIME, a user-friendly tool to help analysts in low and middle income countries estimate the impact and cost-effectiveness of HPV vaccination.